#3B5BB8
Closest named color: Mid Blue (#276AB3). oklch(49.9% 0.152 266.6), rgb(59, 91, 184).
Aa
White text reads best on this color (6.22:1).
About this color
#3B5BB8 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.152 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.043 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #3B5BB8 |
| RGB | rgb(59, 91, 184) |
| HSL | hsl(225, 51%, 48%) |
| OKLCH | oklch(49.9% 0.152 266.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3B5BB8 | 6.22:1 | AA | Lc -85.8 | Fine for body text |
| Black text on #3B5BB8 | 3.37:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #3B5BB8 text on white | 6.22:1 | AA | Lc 80.7 | Fine for body text |
| #3B5BB8 text on black | 3.37:1 | AA large text | Lc -21.2 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F1
oklch(80.9% 0.073 266.7)
-
Step 400
400
#7F9EEA
oklch(70.7% 0.117 266.5)
-
Step 500
500
#6084E4
oklch(63.2% 0.15 266.7)
-
Step 600
600
#476BD2
oklch(55.6% 0.164 266.6)
-
Step 700
700 (this color)
#3B5BB8
oklch(49.9% 0.152 266.6)
-
Step 800
800
#2F4993
oklch(42.7% 0.126 266.5)
-
Step 900
900
#2A3E75
oklch(37.8% 0.097 266.7)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#3B5BB8 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2567BB | 0.033 |
| Deuteranopia (no green cones) | #005BB6 | 0.036 |
| Tritanopia (no blue cones) | #007181 | 0.124 |
| Achromatopsia (no color) | #616161 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B5BB8
#3B5BB8
oklch(49.9% 0.152 266.6)
- #7C5E00
#7C5E00
oklch(49.9% 0.102 86.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3B5BB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.043
- French Blue #436BAD ΔE 0.052
- Iris #6258C4 ΔE 0.055
- Warm Blue #4B57DB ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.061
- Dusky Blue #475F94 ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.071
- Royal Blue #4169E1 ΔE 0.071
Use #3B5BB8 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.